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https://www.925-1000.com/Fnorway_marks.html
The old Norwegian standard of .830 purity silver is still used, but beginning around 1920, .925 purity began replacing it and is now the foremost standard in use. Town names are sometimes included with the required marks and the letters "NM" (Norsk Mønster) are sometimes seen on flatware, this abbreviation is an indication of design patent or copyright.
http://www.silvercollection.it/DICTIONARYEUHALLMARKNORWAY.HTML
The modern Norwegian system of hallmarking came into effect after the 1891 Act. It consists of the national symbol of a crowned rampant lion holding a battle axe inside a circular frame, the silver fineness mark and the maker's mark. In 1892, silver fineness was standardized at .830 and the mark 830S became compulsory.
https://www.925-1000.com/Fnorway_marks2.html
The old Norwegian standard of .830 purity silver is still used, but beginning around 1920, .925 purity began replacing it and is now the foremost standard in use. Town names are sometimes included with the required marks and the letters "NM" (Norsk Mønster) are sometimes seen on flatware, this abbreviation is an indication of design patent or copyright.
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